package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @BelongsProject: reggie_take_out
 * @BelongsPackage: com.itheima.reggie.filter
 * @Author: song
 * @CreateTime: 2022-06-08  01:48
 * @Description: 检查用户是否已经登录
 * @Version: 1.0
 */

@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    // 路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response =(HttpServletResponse) servletResponse;
        // 获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}",requestURI);
        // 定义不需要处理的请求路径
        String[] urls = new String[]{
            "/employee/login",
            "/employee/logout",
            "/backend/**",
            "/front/**",
                "/user/sendMsg",
                "/user/login"
        };
        // 判断本次请求是否需要处理,
        boolean check = check(requestURI, urls);
        // 不需要处理 直接放行
        if (check){
            log.info("本次{}请求不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        // 后台判断：判断登陆状态，如果已经登录，就放行
        if (null != request.getSession().getAttribute("employee")){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }
        // 移动端判断：判断登陆状态，如果已经登录，就放行
        if (null != request.getSession().getAttribute("user")){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }
        log.info("用户未登录！");
        // 未登录则返回未登录结果，通过输出流向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }
    // 判断请求地址是否需要处理
    public boolean check(String requestURI,String[] urls){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        
        return false;
    }
}
